<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="div1">123</div>
<div id="div2">
    <div>1</div>
    <div>2</div>
    <div>3</div>
    <div>4</div>
</div>
</body>
<script src="index.js"></script>
</html>